The Xiaomi Watch S4 global edition has arrived at MWC 2025, bringing the smartwatch’s upgraded display, interchangeable bezel, and accuracy to more users. Xiaomi has pumped the AMOLED’s specs from a fairly paltry 600 nits peak brightness to a whopping 2,200 nits at its peak. The Watch S4 is also said to boast improved heart-tracking algorithms that complement its health and fitness features. While the Watch S line has typically retailed for around $150/£120 in the past, the Watch S4 will instead begin at $185/£150. We’re also a little disappointed that the Xiaomi Watch S4 Sport has not debuted here in Barcelona, but we’ll keep our eyes and ears out for a potential release window for that one.